Improvement in machines for tapping nuts



`Ir`prove`ment in MachnesforTapping Nuts. No. `115,451.

Patented May 39,1871.

JOHN N. 'DUBBI-:LL gsheetpsheef.;

JOHN n. nUnnnLL, or nnmrimr, New YORK.

` IMPROVEMENT iN MACHINES Fon TAPPING NUTS.

Specification forming part of Letters Patent No. 115,451, dated May 30, 1871.

I, JOHN N. DUnRELm ofDunkirk, in `the county of Chautauqua and State of New York, have invented certainilmprovements in Nut- TappingMachines, of which the following is a specification: A

My invention relates to the mechanism for tapping nuts, in which a series of taps and tap-holders is so arranged that the taps enter the nuts vertically from below, and in which the lubricating material contained in a reservoir above the nuts and.` taps is made to fall directly into the orifice of the nuts and upon y the extremity of the tap; and it consists in' certamarrangements and constructions hereinafter specified.

In the accompanying drawing forming part of this specification, Figure I is a sectional elevation of a machine embodying my said improvements; Fig. II is a sectional plan of same 5 Fig.` III is a detail view of nut-holder stops 5 and Fig. IVl is a detail view of drip-plu g. Like letters refer to like parts in each ofthe figures. y

A is a circular table, supported on suitable legs A', and forming the `main frame of the machine. It is cast with a trough, a2, near its outer "edge, and with a number of circularlyarranged bosses, al, which project below the face ofthe table, as shown, and form the bear- Y ings for the tap-spindles b, which pass vertici ally through them. These `spindles are hollow, and are provided `at their upper ends,

which project above the table, with an enlarge, ment, bl,- constructed on its under side with an annular groove, b2, in which fits the upper projectingend a3 of the bearing al. This construction prevents chips and dust which fall l on the table from working between the spindles and their bearings. (l` is the central main 4 driving-shaft, supported at its lower end in a step, c, which restson a cross-tree between the legs A', and having its upper bearing formed in a plate, c,V which is bolted over a central opening in the table A. D D are four gearwheels, of different sizes, rigidly keyed to the shaft (l, being let down through the openin g inthe main table. D D" are the changeable gear for the tapspindles, of sizes to correspond with those onthemain shaft. They are secured on ,the spindle by nuts d at their lower ends, which permit the substitution of one size of gear for another, as may be required. It

is evident that the speed of the spindles can be regulated to the kind of work to be performed by using therewith such size of gear as will correspond and engage with one ofthe A larger or smaller of the gear-wheels D, the

hubs of these changeable gears being made of Y varying lengths, and formed on the one or the other side, so as to retain them at aproper height on the spindles to engage with the corresponding ones on the main shaft. the nut-holder slides, arranged equidistant between the tap-spindles, and supporting on their upper ends the annular oil trough or reservoir F. f f are the taper-drip plugs, arranged vertically over the taps, constructed with an oil-passage,f1, which receives the oil at one side of thepplug and discharges it through the Vplu g at its lower end. They are fitted in taper holes in the bottom of the reservoir, a small recess, f2, being formed in one side of this hole, extending down fromy the top so as to open into the passage in the plug, when the latter is turned so as to cause them to coincide, as is clearly shown in Fig. IV. G represents a nut-holder; 7L, a tap; and I, stops secured and adjusted on the nutholder slides. These stops are constructed of two pieces or halves, 'i t', fastened together by a screw, i', which also operatesto clamp them to the slide. As two of these stops are required to be arranged on the same slide, and sometimes at the same elevation, I, form the ends or jaws which encircle the slide with offsets on the contiguous edges of One-halftheir width, which permit the required adjustment, as shown in Figs. I and III. Motion is communicated to the main shaft by means of a bevel-pinion, J,

on a horizontal shaft, meshing with a bevelwheel on the lower end of this upright shaft. K is an annular oil-collector, similar to the reservoir F, arranged beneath the main table, so as to receive the oil and finer portion of the chips which descend through the hollow tap-spindles above.

- In Fig. I the nut-holderis shown in the position in which it is arrested by the stops aft-er it has passed the head of the tap, which permits the now threaded nut to slide down in the shank of the tap. The nut-holder' being now elevated by the attendant, another blank is arranged in place, and the operation repeatL ed till the shank is filled, when the nuts are E E are maaier' removed by withdrawing the tap from its s in dle, in which it loosely lits. The nut-hol ers and stops are arranged with the slides, as shown in Fig. I, each holder resting against two slides, and each slide receiving the ends of two holders. The trough a2 serves as a receptacle to hold the blanks, so that they may be readily taken up by the attendant as he passes from one tap to the other.

The general operation of my machine, and the advantages which it possesses as to compactness, simplicity, and cheapness of construction, facility, and convenience in operating it, are sufficiently obvious.

That I claim as my invention is 1. In machines for tapping nuts, the annular groove a2 in the bed A, arranged with a series of taps and tap-spindles, the former.

pointing upward and the latter arranged in the bed A, as hereinbefore set forth.

2. rihe arrangement, in relation to one another, to the table A, and central shaft C, of the series of tap-spindles, the series of xed gear-wheels, and the several series of interchangeable gearrwheels, substantially as described.

3. The connection of the upper reservoir F with the table A by means of the slides E placed respectively between and equidistant from the tap-spindles, as described, for the twofold purpose of supporting said reservoir and guiding the nut-holders, substantially as hereinbefore set forth.

4. The construction of the tap-holders with a hole in each extending from end to end, and,

Witnesses WM. BooKsTAvE, S. M. NEWTON. 

